Sea kelp (Ascophyllum nodosum) is a type of brown seaweed known to contain high amounts of phlorotannins and ascophyllan. Phlorotannins may be able to inhibit starch and lipid absorption and ascophyllan is thought to have immunostimulatory properties. Specific applications studied in poultry include:
Ethnoveterinary uses: In British Columbia, sea kelp is given as a supplement in chick starter rations to prevent disease.
Antibacterial: Sea kelp powder may be helpful in reducing the presence of Escherichia coli.